汇管对下游天然气管道速度场影响的数值模拟

Numerical Simulation of Manifold's Effect on the Velocity Field of Gas Pipeline Downstream

对几种常见湍流模型的功能及局限性进行比较分析,得到最合适的模型。并利用CFD软件FLUENT对汇管下游DN100的直管道内部流场进行数值模拟,得到合理的速度场分布。通过对比三种不同工况下的速度场分布,得到三种特定工况条件下,汇管下游的天然气速度恢复均匀稳定时的长度范围,如当Q为554 m3/h时,圆管内气体流动充分发展为稳定状态时的最短管道长度为17D,该长度范围对确定超声波流量计的现场安装位置具有很好的借鉴作用。

By comparative analysis of the functions and limitations of several common turbulence models, the most suitable model was obtained. The velocity field in downstream gas pipe of manifold was numerically simulated by computational fluid dynamics software FLUENT, reasonable velocity field distribution was obtained. By comparing the velocity field distribution of three different operating conditions, the length range of downstream piping which make velocity field restore stability was obtained, for instance, when Q=554 m^3/h, the necessary shortest pipe length is 17D, which could provide the reference for determining the installation position of ultrasonic flowmeter.